PHY OAM and
Lane Fault Monitoring
Li Zeng, Min Ye, Qiwen Zhong, WB Jiang
HUAWEI TECHNOLOGIES Co., Ltd.
IEEE 802.3ba Task Force, 2008
Page 2
Supporters
• Hidenori Takahashi, KDDI R&D Labs
• Jim Tavacoli, Santur Corporation
• Thomas Schrans, Santur Corporation
• Frank Chang, Vitesse
IEEE 802.3ba Task Force, 2008
HUAWEI TECHNOLOGIES Co., Ltd.
Page 3
Outline
• PHY monitoring in 10GE
• PHY OAM and lane fault monitoring in 100GE
• PHY OAM block definition in 100GE
IEEE 802.3ba Task Force, 2008
HUAWEI TECHNOLOGIES Co., Ltd.
Page 4
PHY Monitoring in 802.3ae
•
10GE Link Fault Signaling mechanism
– Reside in Reconciliation Sublayer (RS)
– To monitor link status between local RS & remote RS and perform link status
notification
– Sublayers within the PHY are required to detect faults that render a link unreliable
High Layer
High Layer
MAC
RS
XGMII
LF
PHY
MDI
MAC
LF: Local Fault
RS
RF
Faults detected between
the remote RS and the
local RS
RF
PCS
WIS (Optional)
PMA
PMD
RF
PCS
WIS (Optional)
PMA
PMD
RF: Remote Fault
RF signal originated at
RS when detects LF
RF
RF
IEEE 802.3ba Task Force, 2008
RF
HUAWEI TECHNOLOGIES Co., Ltd.
Page 5
PHY Monitoring in 802.3ae
• Link fault status covers all possible defects detected between
local RS and remote RS
– I/O Signal Detect
– Protocol Detect, includes:
• CODEC Synchronization
• Lane Alignment (Multi-Lane Only, 10GBASE-X)
• WIS Frame/Payload Acquisition
• Link Status Report Recognized
IEEE 802.3ba Task Force, 2008
HUAWEI TECHNOLOGIES Co., Ltd.
Page 6
100GE OAM Requirements
nicholl_01_0308
•Need to monitor at the physical layer to maintain transparency
IEEE 802.3ba Task Force, 2008
HUAWEI TECHNOLOGIES Co., Ltd.
Page 7
100GE OAM Requirements
LOS
E-LPT
AIS
AIS
ETH
ETH
OTN
Domain A
E-LPT
AIS
ETH
ETH
OTN
Domain B
E-AIS
OTN
Domain C
•Ethernet PHY OAM capability can be extended to the multi-lane interface
•Ethernet PHY OAM may transport OTN’s link status information between
the OTN clouds
–E-LPT (Link status Pass-Through)
IEEE 802.3ba Task Force, 2008
HUAWEI TECHNOLOGIES Co., Ltd.
Page 8
100GE Layer Stack
ETH Channel/Service Layer
ETH Path/Tunnel Layer
ETH Section/Link Layer
100GE Physical Section (ETY5PS) Layer
ETY5
ODU4
ETY5
ODU3
ETY5
ODU3-3v
multi lane
MEP
OTU4 OTU4
multi lane
MIP
IEEE 802.3ba Task Force, 2008
HUAWEI TECHNOLOGIES Co., Ltd.
single lane
(future)
Page 9
100GE Layer Stack
Alarm Suppression
ETH Channel/Service Layer
ETH Path/Tunnel Layer
ETH-AIS
ETH Section/Link Layer
ETH-AIS
100GE Physical Section (ETY5PS) Layer
ETY5PS-AIS
ETY5
ODU4
ETY5
ODU3
ETY5
ODU3-3v
multi lane
MEP
OTU4 OTU4
multi lane
MIP
IEEE 802.3ba Task Force, 2008
HUAWEI TECHNOLOGIES Co., Ltd.
single lane
(future)
Page 10
100GE Layer Stack
Alarm Suppression
ETH Channel/Service Layer
ETH Path/Tunnel Layer
ETH-AIS
ETH Section/Link Layer
ETH-AIS
100GE Physical Section (ETY5PS) Layer
ETY5PS-AIS
ETY OAM-LPT
ETY5
multi lane
MEP
ODU3
ETY5
ODU3-3v
ODU-AIS
multi lane
OTU3 OTU3
ODU3
ODU3-3v
OTU3 OTU3
MIP
IEEE 802.3ba Task Force, 2008
ETY5
HUAWEI TECHNOLOGIES Co., Ltd.
single lane
(future)
Page 11
100GE Lane Fault Monitoring Requirements
takahashi_01_0308
•The breakdown of a 100GE link will have a large impact on the whole network.
–Flow protection and route recovery can be difficult for the 100GE path
•Monitoring per lane can be effective for partial lane protection based on partial data
flow
•Standardizing the format of “Lane” fault signal in 802.3ba has been recommended
IEEE 802.3ba Task Force, 2008
HUAWEI TECHNOLOGIES Co., Ltd.
Page 12
OAM on Independent Transport
OTN Network
E-AIS
LOS
Router/Switch
..
.
..
.
LAN
Router/Switch
AIS
AIS
LAN
AIS
•100GE signal can be transported over an ODU4, or over a concatenated set of ODU3 or
ODU2 signals (ODUk-Xv or ODUk-Xc).
•On the current transport network, a set of 40G and/or 10G path transport of 100GE
service will be considered
•When on independent transport model, if one of the OTN links fails, OAM indication
can be sent to relevant lanes to suppress partial flow.
IEEE 802.3ba Task Force, 2008
HUAWEI TECHNOLOGIES Co., Ltd.
Page 13
PHY OAM definition
•OAM block: 64-bit data + 4-bit ctrl
1011
0xa5
Block type:8bits
OAM type: 8bits
•x01H:LLF
•x02H:RLF
•x03H:status advertisement
•x04H:BER Monitor
•Others: reserved
Broadcast OAM / lane OAM : 2bits
lane ID : 6bits
OAM value : 24bits
reserved
IEEE 802.3ba Task Force, 2008
TXD/RXD
TXC/RXC Description
D D
D
D
D
D
D
D
0000
Data
S D
D
D
D
D
D
D
1001
Start
C C
C
C
S
D
D
D
1010
Start
T
C
C
C
C
C
C
C
1000
Terminate
D
T
C
C
C
C
C
C
0111
Terminate
D D
T
C
C
C
C
C
0110
Terminate
D D
D
T
C
C
C
C
0101
Terminate
D D
D
D
T
C
C
C
0100
Terminate
D D
D
D
D
T
C
C
0011
Terminate
D D
D
D
D
D
T
C
0010
Terminate
D D
D
D
D
D
D
T
0001
Terminate
C C
C
C
C
C
C
C
1111
Control
A A
A
A
A
A
A
A
1101
Alignment
O O O O O O O O
1011
OAM
N N
N
N
N
N
N
N
New
Null
X
X
X
X
X
X
X
New
Reserve
X
HUAWEI TECHNOLOGIES Co., Ltd.
Page 14
100GE PHY Monitoring Proposal
• PHY OAM function in 100GE
– Monitor every lane separately
– Distinguish between lane status and link status
• LLF: Local Lane Fault
• RLF: Remote Lane Fault
– Indicate more detailed link or lane status information for management
• Signal fault/defect? Protocol fault/defect? Synchronization error? Etc.
• Fault location indicate
– Mapping between 100GE PHY OAM and transport network OAM
– Some more functions need to be considered
• BER monitor
• Auto negotiate via PHY OAM (in backplane application)
IEEE 802.3ba Task Force, 2008
HUAWEI TECHNOLOGIES Co., Ltd.
Page 15
PHY OAM Mechanism
• PHY OAM based on VL or PL or lambda
–Independent laser monitoring (fault, performance, laser degradation)
–Improve Ethernet PHY reliability
• Steal IPG block for PHY OAM??
–Every 16384 blocks , a PHY OAM block can be sent by stealing from
IPG, which takes only 0.006%(60PPM) of the bandwidth
–Should be discussed more
IEEE 802.3ba Task Force, 2008
HUAWEI TECHNOLOGIES Co., Ltd.
Page 16
Conclusions
• PHY OAM providing the monitoring of a physical lane
– Lane failure will be indicated. (LLF/RLF)
• Implementation of PHY monitoring/PHY OAM
– PHY OAM will be defined by block format
– More functions can be considered by PHY OAM
• Auto Negotiate
• BER monitor
• information advertisement
IEEE 802.3ba Task Force, 2008
HUAWEI TECHNOLOGIES Co., Ltd.
Thank You
HUAWEI TECHNOLOGIES Co., Ltd.
IEEE 802.3ba Task Force, 2008